Portraits in paint

My watercolour self portrait is not yet finished as it would do with some more layers, however I think so far it is alright, it definitely could be better. I tried to make my work look similar to that of John Singer Sargent, as i do love his detailed faces and the way he uses colour. The painting I'm trying to imitate has a beautiful dark background with these vibrant blue and greens that pop out through the darkness. I don't believe I have captured the same background as the watercolour is pigmented enough to have that same pop.